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Forward Citations = 93

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20 inventors (with patents filed for the assignee):

Kozo Shirato (5 out of 9 patents)

Kazuo Hiraizumi (4 out of 5 patents)

Kazuyasu Kawashima (3 out of 6 patents)

4. Masashi Kobayashi (1 out of 20 patents)

5. Akihiko Nagai (1 out of 2 patents)

6. Shinya Okuyama (1 out of 2 patents)

7. Toru Yunoki (1 out of 3 patents)

8. Mitsuru Taguchi (1 out of 2 patents)

9. Shigeru Nakamura (1 out of 2 patents)

10. Sadao Sumikama (1 out of 2 patents)

11. Nobuo Takasu (1 out of 1 patent)

12. Tsuyoshi Yamada (1 out of 2 patents)

13. Susumu Ishiguro (1 out of 2 patents)

14. Akio Kaneko (1 out of 1 patent)

15. Satoshi Shinohara (1 out of 1 patent)

5 patents: Sort by Forward Citations

1. 4680552 - Apparatus for measuring impurities in super-pure water without exposure (1987-07-14),

2. 4651087 - Apparatus for measuring impurities in ultrapure water (1987-03-17),

3. 4629561 - Liquid chromatograph with flow controller (1986-12-16),

4. 4469495 - Method and device for degassifying liquid (1984-09-04),

5. 4126393 - High-sensitivity differential refractometer (1978-11-21),

Erma Optical Works, Ltd. is a leading provider of high-quality optical products. With over 50 years of experience in the industry, we specialize in manufacturing a wide range of optical instruments including microscopes, telescopes, binoculars, and more. Our products are known for their precision, durability, and exceptional performance. We are committed to delivering superior optical solutions to meet the needs of professionals in various fields such as healthcare, research, education, and more. Visit our website to explore our range of products and find the perfect optical instrument for your needs.

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Company Badge

USPTO Data Jan 1 1976 - Dec 9 2025

5 Patents

#2,449 in Tokyo

#6,487 in Japan

Tokyo, Japan

Erma Optical Works, Ltd.